what's x402 protocol?
x402 is an open protocol designed for seamless internet-native payments, leveraging the HTTP 402 "Payment Required" status code to enable direct transactions over APIs. It simplifies monetization by allowing resources like APIs, apps, and web services to require instant stablecoin payments without user registration, emails, OAuth flows, or complex cryptographic signatures. This approach abstracts away blockchain complexities such as gas fees and RPC interactions, making it accessible for developers to integrate payments into existing HTTP-based systems. The protocol facilitates a faster, automated economy, particularly for AI agents that need to pay for data, bypass paywalls, or provision resources dynamically. Built with minimal integration requirements—one line for servers and a simple function for clients—x402 supports ecosystems including stablecoins on networks like Base and Solana. It promotes interoperability and ease of use, positioning it as a standard for onchain commerce in the evolving web infrastructure.
x402 powers AI trading signals for Waveform/SQDGN and enables AI agent payments on Simmer.
Powers trading signal functionality for Waveform AI trading agent in collaboration with SQDGN.
Integrated with Simmer, an AI-native prediction markets platform, where x402 protocol enables AI agents to autonomously pay for data feeds and intelligence services, functioning both as payment method for agents consuming external feeds and as revenue mechanism when external agents pay Simmer for forecasts.
Featured prominently in ETHGlobal's developer activity report for November-December 2025, with x402-powered agentic payments and x402-based intent execution highlighted as key drivers of the AI x Crypto category containing 96 projects.
Collaborates with Brevis and Pieverse to implement ZK-powered, timestamped receipts and provable execution for AI payments on x402b.
Processed over $50M in transactions during the past 30 days ending December 24, 2025.
Brought 22% of unique users to x402 protocol.
Cobbee, a creator support platform, launches on Base integrating x402 protocol for instant USDC payments with 30-second settlement times and 5% fees, and references an upcoming x402 hackathon.
UIUI platform confirms its AI-generated applications and agents are fully integrated with x402 protocol for on-chain agentic interaction.
CARV releases Cashie, an ERC8004 alpha AI Being that handles onchain payouts powered by x402 protocol and CARV ID for multi-linked identity verification.
The protocol bridge records only 19 transactions in 26 hours, with 95% of volume flowing to Solana rather than remaining on Base network.
An AI influencer agent launches on Pearl (the AI agent app store) on Base network, integrating x402 protocol for agent-to-agent commerce and LLM access payments, alongside partnerships with Safe, Web3Auth, Transak, and RelayProtocol.
Circle announces partnership with Openmind that will leverage x402 protocol to enable seamless USDC payments for AI and the machine economy.
The first NFT collection launches on x402 protocol using thirdweb integration, enabling automated NFT minting through a single API call with pay-per-call functionality.
Pearl v1 launches, eliminating manual API key setup requirements for Prediction Agent users and enabling independent LLM resource access through x402 protocol.
The Moon Clave partners with x402 protocol to provide automated USDC rewards and x402 distribution through their hold-to-earn mechanism.
x402 protocol integrates with Covalent's SpeedRun program, enabling builders to deploy one-click smart contracts and make on-chain payments while earning instant $CXT token rewards.
Beep protocol launches on Sui Network, featuring a402 Protocol as an implementation of Coinbase's x402 standard for HTTP-native on-chain payments, with support for USDC and planned expansion to SUI, Walrus, and xBTC.
Protocol introduces multichain swap functionality supporting deposits from Solana, Base, BSC, and Ethereum with one-click swaps to any c-chain asset via Arena wallet.
LLM wallet product launches using MCP technology, enabling any Large Language Model to operate its own crypto wallet for x402 payments and blockchain transactions.
Teneo Protocol's Agent SDK integrates with x402 protocol to enable AI agents to conduct instant commerce with sub-cent micropayments per query.
Trading launches on Ourbit exchange at 04:00 UTC on October 31, 2025, with deposits already open.
$REL token launch scheduled for November 4, 2025, with early allocations available through a Blips campaign on tgmetrics.
x402 and agents are being discussed at SolanaConf (Solana Conference), with inquiry about specific speakers at the event.
Gasless micropayments feature announced for prediction markets, with $sora prediction market launching on BSC using x402 technology and reaching $9.9m market cap.
x402 becomes verified on Base network while Coinbase's Payments MCP integration allows AI agents to access wallets and execute payments via the protocol.
Citi and Coinbase announce collaboration with x402 protocol focused on stablecoin utility and adoption.
PING, a meme coin built on x402 protocol, lists on HTX Innovation Zone Spot Market with deposits open and trading starting soon.
trends.fun calls to co-sponsor a payment-themed hackathon named "x402 索拉拉 Hackathon" and invites Solana team and Huma Finance to join the planning.
a16z's State of Crypto report features x402 protocol as emerging infrastructure for autonomous agent payments, with the autonomous agent economy projected to reach $30T by 2030.
x402 enables cross-chain USDC payments for video creation based on onchain events from LootSurvivor game.
Cloudflare adds x402 to their Agents SDK, Vercel creates the x402-mcp SDK, and Merit Systems launches x402scan explorer and ai-x402 SDK for AI resource coverage.
Echo's AI resources are now available behind x402 payment infrastructure, with VercelAI SDK wrapped to enable USDC to AI purchases for developers.
DFlow and Corbits_Dev integrate JIT Routing and Solana liquidity into the x402 payment framework for agentic commerce.
Noble announces launch of Noble EVM AppLayer in the coming weeks, with x402-type integrations cited as key reason for excitement about the stablecoin chain's payments infrastructure.
x402 powers programmable payments for SpeedRun by Covalent, a Prompt-to-Earn platform where users deploy onchain apps and earn rewards. Cohort 2 opens for participants with additional slots releasing next week.
x402 wraps dosco's ax library to enable on-demand inference for payment-enabled agents, with release scheduled for this week including examples.
Collaboration with ERC-8004 protocol revealed, positioning the project as a stablecoin payment layer for agents compatible with multiple protocols including MCP, A2A, ERC-8004, and AP2.
x402scan, an open-source block explorer for the ecosystem, is announced and actively seeking contributors.
Coinbase announces foundation to support the protocol and Cloudflare announces support for the project.
New router enables signature-based payments for cloud compute access, currently on Base with planned expansion to Solana and Starknet.
Payment protocol integrates with Heurist platform.
Coinbase has launched a payment standard specifically designed for machine-to-machine crypto transactions via HTTP protocol.
New onchain payments protocol launches, enabling keyless API access for developers and AI agents.